Lemov is a managing director of the charter school organization Uncommon Schools, which runs 32 schools in New York, New Jersey, and Massachusetts. When hiring a teacher, Lemov says, "I look for a growth mindset, someone who is eager to learn, incorporates feedback, embraces challenge, and is humble. That's the kind of individual who over time will surpass the teacher who is seemingly more proficient but resists feedback, wants to 'freelance,' or lacks humility."